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ACARA III
VISKOSITAS ZAT CAIR
A. PELAKSANAAN PRAKTIKUM1. Tujuan Praktikum
a. Menentukan koefiien !ikoita "kekenta#an$ %at &air 'er(aarkan )ukum Stoke. '. Mema*ami a(an+a ,eekan +an, (ie'a'kan 'en(a 'er,erak (a#am f#ui(a atau %at
&air.-. aktu Praktikum
Sa'tu/ 0 Mei -123. Tem4at Praktikum
Lantai II/ La'oraturium 5iika 6aar/ 5aku#ta Matematika (an I#mu Pen,eta*uan
A#am/ Uni!erita Mataram
7. ALAT 6AN 7A)AN1. A#at8a#at Praktikuma. 9e#a ukur 1 m# "1 'ua*$
'. 9e#a ukur - m# 'erii %at &air "- 'ua*$&. :an,ka oron, "1 'ua*$(. Nera&a ana#itik "1 'ua*$e. Pen,,ari 2 & "1 'ua*$f. Penje4it "1 'ua*$,. Pi4et tete "3 'ua*$*. Sarin,an "- 'ua*$i. Stopwatch "1 'ua*$
-. 7a*an8'a*an Praktikuma. 7o#a "1 'ua*$b. Tissue "1 ro##$&. Zat &air min+ak "- m#$(. Zat &air o#i "- m#$
C. LAN6ASAN TEORI
6. PROSE6UR PERCO7AAN1. 6i&ari ra4at maa 'o#a
a. 6iukur (iameter 'o#a e'an+ak 1 ka#i (i tem4at +an, 'er'e(a men,,unakan jan,kaoron,.
'. 6itim'an, 'o#a e'an+ak 1 ka#i men,,unakan nera&a ana#itik.&. 6i*itun, ra4at maa 'o#a/ ra4at maa rata8rata 'o#a (an ra4at maa jeni 'o#a.
-. 6i&ari ra4at maa &airana. 6itim'an, ,e#a ukur 1 m# e'an+ak 1 ka#i men,,unakan nera&a ana#itik.
'. 6imaukkan f#ui(a ke (a#am ,e#a ukur 1 m#/ kemu(ian (itim'an, ,e#a ukur +an,
'erii &airan e'an+ak 1 ka#i.&. 6i*itun, ra4at maa &airan (en,an men,uran,i maa ,e#a ukur 'erii &airan
(en,an maa ,e#a ukur.
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(. 6i*itun, ra4at maa rata8rata &airan (an maa jeni &airan.e. 6i#akukan kem'a#i 4roe(ur "a am4ai (en,an ($ (i ata untuk %at &air +an, 'er'e(a.
3. 6itentukan koefiien kekenta#an %at &air a. 6iatur jarak ejau* 3 &m men,,unakan 4en,,ari (an (i'uat tan(a 4a(a ,e#a ukur.
'. 6ijatu*kan 'o#a ke (a#am f#ui(a (an men&atat ;aktu aat 'o#a men&a4ai jarak 3 &m.&. 6iu#an,i #an,ka* "a am4ai (en,an '$ e'an+ak 1 ka#i.
(. 6itentukan koefiien kekenta#an f#ui(a.e. 6i#akukan kem'a#i 4roe(ur "a am4ai (en,an ($ (i ata untuk %at &air +an, 'er'e(a.
E. )ASIL PEN9AMATAN1. Men&ari ra4at maa 'o#a "a$
No 6iameter "m$ :ari8jari "m$ Maa ",r$
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No m1 ",r$ m- ",r$1 >= 0 0 >
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1 1/-0< × 18-1/-0< × 18
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- 1/-0< × 18-1/-0< × 18
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3 1/-0< × 18-1/-0< × 18
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> 1/-0< × 18-1/-0< × 18
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< 1/-0< × 18-1/-0< × 18
-
2 1/-0< × 18- 1/-0<
×
1
8
-
0 1/-0< × 18-1/-0< × 18
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? 1/-0< × 18-1/-0< × 18
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= 1/-0< × 18-1/-0< × 18
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1 1/-0< × 18-1/-0< × 18
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∑ r @ 1/-0<
× 181
∑ "r 8 ṝ $-
@
∴ ṝ @∑r
n
@1,275×10-1
10 @ 1/-0<× 18- m
∴ ∆ r @ √∑(r−ṝ )2
n−1
@ √0
9 @ m
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:a(i jari8jari 'o#a " ṝ ± ∆ r$
• " ṝ ∆ r$ @ 1/-0< × 18- @ 1/-0< × 18- m
• " ṝ 8 ∆ r$ @ 1/-0< × 18- 8 @ 1/-0< × 18- m
'. Maa 'o#a "m$
No m "k,$ m B "k,$ m8 m B "k,$ "m8 m B $- "k,$
1 =/ =/20 × 183=/2 × 181-
< =/22 × 183=/2 × 181-
2 =/01 × 183=/2 × 181-
= =/0 × 183=/2? × 182 -3> × 181-
1 =/01 × 183=/2
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@96,52×10-3
10 @ =/2
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@63,38 × 10-6
0 @ @ kg
m3
:a(i maa jeni 'o#a " ρb ± ∆ ρb $
• " ρb ∆ ρb $ @ 111 @ 111
kg
m3
• " ρb 8 ∆ ρb $ @ 111 8 @ 111kg
m3
-. Per*itun,an ra4at maa %at &air
a. Maa jeni min+ak " ρ m$
• Maa min+ak
N
o
m1 "k,$ m- "k,$ m "k,$ m B "k,$ m8 m B "k,$ "m8 m B $- "k,$
1 >= ×
183
× 183 ?/> ×
183
322 ×
182133=0 ×
183
×
183
821> ×
182302==2 ×
181-
3 >0 ×
183
> ×
183
811> ×
1821-==2 × 18
1-
> > ×
183
02 × 18
2
> ×
183
832> ×
18213->=2 ×
181-
2 > ×
183
12 ×
18211-32 × 18
1-
0 > ×
1831-2 ×
1821
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183 183 183
∑ m @ ?1/>>
× 183
0>0?> ×
181-
∴ m @ m- 8 m1 "(itu#i +a atu atu &ari mn+a (ari 4er&o'aan 4ertama m4e
1/ tin,,a# (itu#i/ *ai#n+a u(a a(a (i ta'e# (an jan,an #u4a ertakan atuann+a$
∴ ḿ @∑m
n
@81,44×10-3
10 @ ?/1>>× 183 k,
∴
∆
m @
√
∑(m−ḿ)2
n−1
@ √747840×10-12
9 @√ 83093,33×10-12 @ -??/-< × 182 k,
:a(i maa min+ak "m B ± ∆ m$
• "m B ∆ m$ @ ?/1>> × 183 -??/-< × 182 @ ?>3-/-< × 182 k,
• "m B 8∆ m$ @ ?/1>> × 183 -??/-< × 182 @ 0?
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@8,144 ×10-3
10 × 10-6 @ ?1>/>
kg
m3
∴ ∆ ρm @∆ m
∆ v
@288,25 ×10-6
1× 10-6 @ -??/-<kg
m3
:a(i maa jeni min+ak " ρm ± ∆ ρm $
• " ρm ∆ ρm $ @ ?1>/> -??/-< @ 11-/2<kg
m3
• " ρm 8 ∆ ρm $ @ ?1>/> 8 -??/-< @
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183 183 183 182
1 >= ×
181-
∴ m @ m- 8 m1 "(itu#i +a atu atu &ari mn+a (ari 4er&o'aan 4ertama m4e
1/ tin,,a# (itu#i/ *ai#n+a u(a a(a (i ta'e# (an jan,an #u4a ertakan atuann+a$
∴ ḿ @∑m
n
@80,41×10-3
10 @ ?/>1 × 183 k,
∴ ∆ m @ √∑(m−ḿ)2
n−1
@ √274090×10-12
9 @√ 30454,44 ×10-12 @ 10>/1 × 183 10>/
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∴ ρo @ḿ
v
@8,041×10-3
10 ×10-6 @ ?>/1kg
m3
∴ ∆ ρo @∆ m
∆ v
@174,51 ×10-6
1 × 10-6 @ 10>//1 10>/ m
• " 8 ∆ $ @ /3 8 /1 @ /- m
aktu tem4u* 'o#a "t$
No t "$ "$ ṯ t 8 "$ ṯ "t 8 $ ṯ - "$-
1 1/ 1/3= 8 /3= /1
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= 1/< 1/3= /11 /1-11 1/1 1/3= /21 /30-1
∑ t @ 1/3= ∑ "t 8 $ ṯ - @
/ ≈ =/1- × 18>
@ =/1- ×
183
Nm8-
@ =/1- ×
183
Pa
@ =/1- × 18- 4oie
'. O#i:arak tem4u* "$
∴ @ 3 &m @ /3 m
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∴ ∆ @1
2 ka#a terke&i#
@1
2 . /- @ /1 m
:a(i jarak " ± ∆ s $
• " ∆ $ @ /3 /1 @ /> m
• " 8 ∆ $ @ /3 8 /1 @ /- m
aktu tem4u* 'o#a "t$
No t "$ "$ ṯ t 8 "$ ṯ "t 8 $ ṯ - "$-
1 1/= 1/>3< />2< /-12--3< /12< /-0--<3 1/-2 1/>3< 8 /10< /32-<> 1/30 1/>3< 8 /2< />--<< 1/1? 1/>3< 8 /-3< 8 /13< /1?--<
1 1/31 1/>3< 8 /1-< /1/3< ∑
"t 8 $ ṯ -
@/>1>2<
∴ @ ṯ ∑ t
n
@14,35
10 @ 1/>3<
∴ ∆ t @
√
∑(t − ṯ )2
n−1
@ √0,41465
9 @√ 0,0460722222 @ /-1>2>>>?0 ≈ /-1<
:a(i ;aktu " ṯ ∆ t $
• "t ∆ t$ @ 1/>3< /-1< @ 1/2<
• "t 8 ∆ t$ @ 1/>3< 8 /-1< @ 1/--
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Koefiien kekenta#an " η $
∴ η @2 ṝ 2 g ṯ ( ρb− ρo)
9s
@2(1,275× 10-2)2 ×9,8 ×1,435(1110−978,61)
9 ×0,3
@ --->/=? × 18> ≈ ---< × 18>
@ ---/< × 183 Nm8- @ ---/< × 183 Pa
@ ---/< × 18- 4oie
9. PEM7A)ASAN). PENUTUP
6A5TAR PUSTAKA
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